Hoisting mechanism.



G. W. MURRAY. HOSTING MECHANISM. APPLICATION FILED NOV. 16, 1908.

' PatentedJune 28, 1910.

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APPLIGATION FILED Nov. 16, 1908.

Patented June 28, 1910.

tion.

GEORGE W. MURRAY, OF CHICAGO, ILLINOIS.

HOISTING MECHANISM.

Specification of Letters Patent.

Application nletl November 16, 1908.

962,779. Fatented J une 28, 1910.

Serial No. 462,785.

To all whom it may concern:

Be it known that l, GEORGE W. MURRAY, citizen of the United States, residing at Chicago, in the county of Cook and State of llinois, have invented a certain new and useful Improvement in Hoisting Mechanism, l of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to hoisting mechanism by means of which burdens may be lowered, elevated and transposed.

The invention will be readily understood by reference to the accompanying drawings, showing the preferred embodiment thereof, in which- Figure l is a side elevation of the machine constructed in accordance with my inven- Fig. 2 is a sectional plan view on line Q 2 of Fig. l. Fig. 3 is a sectional plan view on line 3 3 of Fig. 1. Fig. 4 is a sectional elevation on line 4 4 of Fig. 3 of a part of the structure. Fig. 5 is a plan view of the upper portion of the struct-ure appearing in Fig. 1. Fig. 6 is a view of a part of the structure taken in the direction of arrow 6 of Fig. l. Fig. 7 is a sectional view of the mechanism appearing in Fig-6 on line 7 7 of Fig. 6. Fig. 8 is an elevation of the grappling mechanism that preferably enters into the construction of my invention. Fig. 9 is a sectional plan view on line 9 9 of Fig. 8.`

Like parts are indicated by similar characters of reference throughout the dierent figures.

The apparatus of my invention is adapted for use in various associations. Vhen made of one size, it may be employed as a household convenience, and in the embodiment of the invention shown in Fig. 1, the form of the invention that is adapted for household service is illustrated. Then made in other sizes, it may be adapted for heavier work and for use upon the exterior of buildings and in factories.

The apparatus of my invention is desirably made portable, to which end its base a is provided with suitable supporting means that permits the base together with the superposed structure,to be moved about. This supporting means, in the embodiment of the invention illustrated, includes a cross-shaped structure Z), the arms of which are provided l with roller bearing casters o at their outer extremities, which casters rest upon the floor or other supporting body Z over which the hoisting apparatus is to be moved.

The base a of the structure of my invention is desirably made in two symmetrically arranged parts each having a ball race-way for receiving ball-bearings e. By forming the base a in two parts and having the upper part rest upon balls that are supported upon the lower part, the hoisting apparatus proper may be rotated to certain selected positions without the necessity of bodily shifting the entire base structure. Parallel rack-guiding members or standards are mounted upon the upper and rotatable half al of the foundation a, these rack-guiding members being held a fixed distance apart by means of their mounting upon the movable element al of the base structure and by means of the distance-preserving device f1 at the upper portion of the structure, distance preserving device f1 being merely a cleat that is secured to the members f to hold the same a fixed distance apart. A vertically movable rack bar g is disposed between the members f f and is guided thereby in vertical travel, the opposed faces of the members f f desirably having vertically disposed grooves which receive ribs g1 g2, whereby the rack bar g is confined to a straight line vertical movement.

The standards f support a bracket structure 7L that aords a journal mounting for an actuating pinion i in mesh with the teeth of the rack bar g (Fig. 1). The shaft of the pinion i is made square at l so as to be adapted to engage a correspondinglyshaped opening in an operating handle which is desirably removably located upon the portion 1. Then the operating handle is in position, the pinion may be turned in one direction or the other to elevate or lower the rack bar g, the structure shown in Figs. l, 3 and 4 being employed to holdsaid rack bar in its position of vertical adjustment. The said structure shown in Figs. 1, 3 and 4 includes a pivotally mounted locking dog or detent 7c which may be swung into and the rib g2. lVhen the rack bar is to be elevated or lowered, the detent 7c is swung out of position, and when said rack bar has been brought to the selected position, said detent 7c is swung back until it engages one out of alinement with teeth Z formed upon 10 of the teeth Z, whereby the descent of the rack bar is thereafter prevented.

The rack bar g supports at its upper end a suitable grapple-carrying beam m, which, in the embodiment of the invention illustrated, extends upon both sides of said rack bar and is provided with sheaves or pulleys 0 and p located at the ends of the grapplesupporting element m, whereby, by means of the cable or rope (I and mechanism to be described, the grappling mechanism 'r which is adapted to engage the load to be lifted, lowered or transposed, may be operated. The rope g at one end is connected with suitable winding mechanism to be described and is anchored at its other end to an eye s provided beneath the beam m. The grap- A pling mechanism r is desirably of usual construction, having pivotally united crossed members whose upper ends are vcarried by pulley mechanism t rolling within a bight of the rope g. I/Vhen the grappling' mechanism 11 is to be engaged with a. load, the lower portions of the tong-shaped members are spread apart sufficiently to enable the hook portions thereof to engage the load, whereafter an elevation of the rope Q will force the lower portions of the tong-shaped members together, thereby enabling the same to engage the load, whereafter the load may be swung merely by rotating' the structure upon the lower half of the base-element a or may be shifted by bodily moving' the structure upon the casters c and which load may be elevated or lowered by operating the pinion z', it being' understood, of course, that the load may also be elevated and lowered by taking up or paying out Athe rope g, the prime, but not the only, function of lthe mechanism that adjusts the position of the beam m being to approximately adjust the height to which or from which the grappling mechanism fr may transfer a load, the load, in ordinary operation, being' thereafter manipulated by the rotating or bodily movements of the structure which have been described and by taking' up and paying out the rope g.

IVhere the structure is to be used within the interior of a vmndmg' and is to 'be adapted to be projected through the building, in order that loads upon the exterior of t-he building may be manipula-ted, I desirably provide the beam m with a supporting strut a pivotally mounted beneath the beam m and connected therewith and provided with an angular formation at its Vlower end adapted to engage with a sill u1.

In the embodiment ofthe invention vshown l and particularly described, I provide 'the grappling mechanism r with roller mechanism o (Figs. l, 8 and 9), lso lthat violent contact of the grappling' mechanism or load with the wall of the building may thereby be avoided, the roller mechanism t `concentric with relation to the detaining pawl or locking teeth of the further preventing the load and mechanism from scraping the wall as said load and grappling mechanism are moved.

s mechanism for taking up and paying out the rope g, I prefer the structure illustrated most clearly in Figs. 1, 6 and 7, which includes a rope-Winding drum fw journaled upon a bracket structure w1 carried by the standard structure f. rEhe operating handle is illustrated upon the shaft of a pinion m1 that is in mesh with a spur-gear U02 fixed upon and co-axial with the drum w, a turning movement imparted to the handle operating the pinion x1, thereby occasioning the rotation of the spur-g'ear x2 together with the drum w fixed with respect to said spurgear. The pinion w1 being' of smaller diameter t-han the spur-gear 602, increases the power transmitted from the handle a; to the winding drum. The drum w about which the rope Q is to be wound has fixed thereupon a ratchet g/ whose teeth are adapted to be engaged by a locking pawl .or detentgfL that is pivotally mounted upon the same bracket structure that carries the drum w. A braking-wheel z is fixed upon and the winding drum w and is designed to cooperate with a shoe al of a brake, which brake-shoe is fixed with respect to the detaining pawl y1,

grappling sthe elements y] and el being together mountled upon a common pivot e2.

to rotate the wheel 1/ in an opposite direction, the detaining' pawl y/l thereupon exercising' its office to prevent the unwinding of the drum w. Then it is desired to pay out rope to lower th-e load carried by the grappling mechanism r, I may release the engag'ement between the ratchet wheel fz/ and dog v 1, but in order that the descent of the load lmay not be too abrupt, the rotation of the drum w is to be checked by means of the braking mechanism 2 el. The pawl mechanism g/l and the brake mechanism el are desirably provided with a common actuating handle z3, by the movement of which in one direction the pawl y1 may be disengaged from the wheel y and the brake-shoe el may be moved toward the brakewheel c. in the reverse direction causes the brakeshoe al to recede, a. suiiicient movement of the handle z3 in this reverse direction permitting of the rengagement of the locking pawl g/l with the ratchet wheel y. The relation of the elements g/l c1 is such that the element c1 may not be applied to the braking-wheel .e until an appreciable time after the pawl y1 has been disengaged from the ratchet wheel y. If desired, the handle a1 A movement of the handle a3 may be grasped to check the rotation of the drum w during the interval existing between the time that the pawl y1 is disengaged from the wheel y and the brake-shoe .el is brought into engagement with the brake-wheel e. Thereafter, by suitable manipulation of the handle e3, the descent of the grappling mechanism and the load carried thereby may readily be regulated.

Inasmuch as theapparatus of my invention is preferably constructed in portable form, I preferably provide in association therewith a handle structure illustrated in Figs. l and 2 including a handle bail A carrying the handle grip B at one end and pivoted at its other end to the bases of segmental locking plates Cmounted upon the standards f1, said handle bail and segmental locking plates being provided with apertures that may be brought into register to permit of the reception of locking pins D, whereby the handle structure may be adjusted at convenient angles.

Suitable bracing mechanism E intervenes between the base member al and the standards f, there being desirably four struts included within the bracing mechanism E that unite the element al with the standards. An additional bracing device El is inter'- posed between the lower end of the rack bar y] and the beam m. rIhe bracing mechanism E uniting the standards f with the base element a1 and the bracing mechanism E1 uniting the rack bar g with the beam m, coperate to secure a very rigid inter-relation of the beam m, the standards f and the base element al, even though the beam m be elevated. For purpose of shipment and storage, the upper end of the brace El is desirably separable from the beam m and the beam m is desirably in movable or separable relation with the rack bar g, whereby these parts may be collapsed.

While I have herein shown and particularly described the preferred embodiment of my invention, I do not wish to be limited to the precise construction shown, as changes may readily be made without departing from the spirit of my invention.

Having thus described my invention, I claim as new and desire to secure by Letters Patent the following:

l. Hoisting mechanism including a base, standards supported upon the base, a rack bar guided by the standards in vertical movement and located between the standards, mechanism for effecting vertical movement of the rack bar, a load-supporting beam carried by the rack bar at its upper end, a brace intervening between the beam and the rack bar, and bracing mechanism intervening between the standards and the base of the structure.

2. Hoisting mechanism including a base, standards supported upon the base, a rack bar guided by the standards in vertical movement and located between the standards, mechanism for effecting vertical movement of the rack bar, a load-supporting beam carried by the rack bar at its upper end, a brace intervening between the beam and the rack bar, bracing mechanism intervening between the standards and the base of the structure, and rope and pulley mechanism carried by the beam.

3. Hoisting mechanism including a rotatable base, standards supported upon the base, a rack bar guided by the standards in vertical movement and located between the standards, mechanism for effecting vertical movement of the rack bar, a load-supporting beam carried by the rack bar at its upper end, a brace intervening between the beam and the rack bar, and bracing mechanism intervening between the standards and the base of the structure.

4. I-Ioisting mechanism including a rotatable base, standards supported upon the base, a rack bar guided by the standards in vertical movement and located between the standards, mechanism for effecting vertical movement of the rack bar, a load-supporting beam carried by the rack bar at its upper end, a brace intervening between the beam and the rack bar, bracing mechanism intervening between the standards and the base of the structure, and rope and pulley mechanism carried by the beam.

5. Hoisting mechanism including a base, standards supported upon the base, a rack bar guided by the standards in vertical movement and located between the standards, mechanism for effecting vertical movement of the rack bar, a load-supporting beam carried by the rack bar at its upper end, a brace intervening between the beam and the rack bar, bracing mechanism intervening between the standards and the base of the structure, and a carrier for the base provided with casters whereby the base may be bodily shifted.

6. Hoisting mechanism including a base, standards supported upon the base, a rack bar guided by the standards in vertical movement and located between the standards, mechanism for effecting vertical movement of the rack bar, a load-supporting beam carried by the rack bar at its upper end, a brace intervening between the beam and the rack bar, bracing mechanism intervening between the standards and the base of the structure, rope and pulley mechanism carried by the beam, and a carrier for the base provided with casters whereby the base may be bodily shifted.

7 Hoisting mechanism including a rotatable base, standards supported upon the base, a rack bar guided by the standards in vertical movement and located between the standards, mechanism for eecting vertical movement of the rack bar, a load-supporting beam carried by the rack bar at its upper end, a brace intervening between the beam and the rack bar, bracing mechanism intervening between the standards and the base of the structure, and a carrier for the base provided with casters whereby the base may be bodily shifted.

8. Hoisting mechanism including a rotatable base, standards supported upon the base, a rack bar guided by the standards in vertical movement and located between the standards, mechanism for eecting vertical movement of Jthe rack bar, a load-supporting beam carried by the rack bar at its upper end, a brace intervening between the beam and the rack bar7 bracing mechanism intervening between the standards and the base of the structure, rope and pulley mechanism carried by the beam, and a carrier for the base provided with casters whereby the base may be bodily shifted.

In witness whereof, I hereunto subscribe my name this thirteenth day of November A. D., 190e.

GEORGE 7. MURRAY.

fitnesses G. L. CRAGG, L. G. STRoI-L 

